17,371 research outputs found
Analysis of the Vertical Temperature Profile Radiometer (VTPR) radiometric problem
Variations in bias radiation, on the detector as a function of scan mirror position, are reported for the VTPR instruments presently in orbit. Tests in the laboratory show that this bias radiation disappears when optical baffles are added. A detailed analysis explains quantitatively the observed bias variation which is due to the extraneous field-of-view of the detector, and the variation in magnitude of the far field-of-view solid angle as a function of mirror position
Holomorphic Bisectional Curvatures, Supersymmetry Breaking, and Affleck-Dine Baryogenesis
Working in supergravity, we utilize relations between holomorphic
sectional and bisectional curvatures of Kahler manifolds to constrain
Affleck-Dine baryogenesis. We show the following No-Go result: Affleck-Dine
baryogenesis cannot be performed if the holomorphic sectional curvature at the
origin is isotropic in tangent space; as a special case, this rules out spaces
of constant holomorphic sectional curvature (defined in the above sense) and in
particular maximally symmetric coset spaces. We also investigate scenarios
where inflationary supersymmetry breaking is identified with the supersymmetry
breaking responsible for mass splitting in the visible sector, using conditions
of sequestering to constrain manifolds where inflation can be performed.Comment: 9 page
A minimal nonfinitely based semigroup whose variety is polynomially recognizable
We exhibit a 6-element semigroup that has no finite identity basis but
nevertheless generates a variety whose finite membership problem admits a
polynomial algorithm.Comment: 16 pages, 3 figure
Entanglement production in quantum decision making
The quantum decision theory introduced recently is formulated as a quantum
theory of measurement. It describes prospect states represented by complex
vectors of a Hilbert space over a prospect lattice. The prospect operators,
acting in this space, form an involutive bijective algebra. A measure is
defined for quantifying the entanglement produced by the action of prospect
operators. This measure characterizes the level of complexity of prospects
involved in decision making. An explicit expression is found for the maximal
entanglement produced by the operators of multimode prospects.Comment: Latex file, 7 page
Photochemical reactions of benzophenone and cyclohexene
Aldehydes and ketones absorb weakly in the 290 mμ region of the ultraviolet spectrum, and also at 200 mμ (this wavelength region being analogous to that occurring in the spectra of olefinic compounds). This weak absorption band in the carbonyl absorption spectrum can be attributed to an n → π* transmission of a non-bonding electron on the oxygen atom to an anti-bonding π orbital in the multiple bond to give a singlet state. It is this absorption and consequent formation of an energized state which appears responsible for most of the photochemical transformation of saturated ketones in condensed (liquid) phases. After absorption, the energy may be disposed of by re-emission, by photochemical reactions such as dissociation, rearrangement and reaction with the medium, by intersystem crossing, or by internal conversion. Reactions will be run of all these reactants (benzophenone, cyclohexene and isopropanol) both with and without the presence of oxygen and of just cyclohexene and benzophenone both with and without the presence of oxygen
Stress analysis of a doubly-curved skin with a flared nozzle port, phase v annual summary report
Computer method for stress and deflection calculation of nozzle flow openings in large pressure vessels
Black Markets for Currency, Hoarding Activity and Policy Reforms
In the former Soviet Union and throughout Eastern Europe, black-market exchange rates and second-economy prices often are interpreted by policy-makers as indicative of post-reform levels. However, these exchange rates and prices can provide highly-biased signals for policy setting. These biases are especially important when exchange rates fixed on the basis of these signals are expected to play a nominal anchor role during stabilizations. This paper traces the paths and biases in black-market exchange rates, second-economy prices, hoarding stocks, and privately-held dollars balances after policy-initiatives or other changes in the economic environment are implemented. The stimuli studied are official exchange-rate adjustments, price reforms, foreign-aid packages, altered risks of monetary confiscation or currency reforms, and goods-supply related initiatives. We provide the conditions under which announcements of reform lead short-run prices or exchange rates to overshoot or to undershoot their long-run equilibrium levels
Debye Potentials for Maxwell and Dirac Fields from a Generalisation of the Killing-Yano Equation
By using conformal Killing-Yano tensors, and their generalisations, we obtain
scalar potentials for both the source-free Maxwell and massless Dirac
equations. For each of these equations we construct, from conformal
Killing-Yano tensors, symmetry operators that map any solution to another.Comment: 35 pages, plain Te
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